Clinician
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Post by mjcharger on Apr 27, 2011 17:08:45 GMT -6
My Kymco Agility 125cc is having ignition problems and i'm running out of things to check. I tried changing the spark plug, changed ignition coil, changed the CDI, grounding the spark plug, checked the killswitch, looked for shorts in the ignition wiring, cleaned the flywheel magnet and pulsar coil head, AND still nothing.
I followed the diagnostics for no spark in the library section of the forum.
Can anyone compare these values to a working stator? I'm guessing its a bad stator but I wanted to check.
Blue & Yellow wire: .4 ohms resistance, produces .4v AC when turning over.
White wire: .5 ohms resistance, produces 9V AC when turning over
Yellow wire: .38 ohms resistance, produces 7 V AC when turning over.
Thanks
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Scooter Doc
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Post by sprocket on Apr 27, 2011 17:32:42 GMT -6
Sounds like a bad stator... on the GY6 engines the stator puts out 50- 60 volts AC on the white wire and ground and the yellow wire and ground..
Sorry I have nothing else to compare it to...
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Post by mjcharger on Apr 27, 2011 17:41:12 GMT -6
Ok well thats re-assuring to hear. My Kymco is a KDU engine. The next step up from a GY6. Anyone know where I can get a cheap flywheel puller?
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Scooter Doc
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Post by sprocket on Apr 27, 2011 18:52:05 GMT -6
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Clinician
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Post by mjcharger on Apr 28, 2011 16:00:06 GMT -6
Ok i'm just about to order a flywheel puller and new stator, but just want to check one last thing. If my stator is bad would it not produce any sparks? Or just one spark and then nothing?
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Scooter Doc
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Post by sprocket on Apr 28, 2011 16:03:24 GMT -6
Just re-read your posting.. there is a wire missing...
What is the voltage on the red and black wire that goes from the stator to the CDI? It is what runs the engine...
Your wire colour may be different. It should be somewhere for 50 to 100 volts AC
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Post by sprocket on Apr 28, 2011 16:06:46 GMT -6
This is a typical GY6 set-up Attachments:
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Post by mjcharger on Apr 28, 2011 18:21:57 GMT -6
I only have four wires exiting the generator. Blue/ yellow, white, yellow, and green. It ran fine before with that. I colored a wiring diagram for it. -Blue/ yellow wire goes to the CDI & Key switch -White goes directly to the regulator/ rectifier -Yellow goes to the regulator/ rectifier & headlight - Green grounds out. No red wire anywhere. This engine is a KDU style. I was told its a twist on a GY6 engine Attachments:
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Post by sprocket on Apr 29, 2011 11:56:09 GMT -6
Ok, then the voltage on the line going from the stator to the CD should be a higher voltage.
The blue yellow wire is the voltage out of the CDI and it runs to the coil...that is like the black/yellow in my drawing.
But there has to be a high voltage maybe 50 volts AC running from the stator to the CDI on the blue/yellow
This is quite simple... the voltage comes from the stator at about ~50 volts and goes to the CDI. Here the capacitors charge and the voltage is jumped up several times...
The when the flywheel pick-up coil sends a pules of low voltage, the CDI empties the charge in the capacitors and this is sent to the ignition coil.
The ignition coil gets the charge and bumps it up again in voltage and it is then sent down the hi-tension lead to the plug which sparks.
Then everything repeats...
So, you don't have enough charge coming off the stator on the blue /yellow of the CDI to make a good enough spark at the plug...
The wires running to the R/R have nothing to do with the running of the engine...as far as I'm aware...
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Post by mjcharger on May 2, 2011 1:18:44 GMT -6
Ok I got the scooter working. It was a bad pulsar coil. I bought a new one and installed it and the scooter fired right up. On the new stator & pulsar coil I measured the resistance and voltage.
Key off:
Blue/ Yellow wire- resistance 111 ohms
Yellow wire- .6 ohms
White wire- .7ohms
Key on, scooter not turning over:
Blue/ Yellow-112 ohms
Yellow- 7 ohms
White wire- 6.8 ohms
Just turning over the engine:
Blue/ Yellow wire- resistance .9 killi ohms, .23 volts
Yellow wire- no continuity, 7 volts
White wire- resistance 0 ohms, 9.1 volts
Engine running:
Blue/ Yellow wire- resistance ohms, .76 volts
Yellow wire- resistance ohms, 11.6 volts
White wire- resistance ohms, 17.5 volts
Hope this helps someone save a lot of time when their trying to know if their stator/ pulsar coil is bad!
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Post by jtlogan on Jun 18, 2012 14:06:42 GMT -6
I read your story with interest. Mine is similar. Where did you get the pulser coil for your Kymco 125? I can't find one online, and the local dealer says it's part of the stator assembly. Did you have to buy the whole stator assembly?
And when you got the stator, was the metal core inside the pulser coil a permanent magnet? When mine was was loose, it grabbed onto any nearby steel part.
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